Ultrasonography, InterventionalAmbystoma mexicanumRegenerationExtremitiesTurbellariaNotophthalmusAmbystomaNotophthalmus viridescensForelimbCell ProliferationSalamandridaeAnimal FinsPlanariansTriturusTailCell DifferentiationAmputationCells, CulturedSignal TransductionCell DivisionUrodelaPleurodelesWilms TumorIn Situ HybridizationApoptosisNerve TissueZebrafishBromodeoxyuridineGene Expression Regulation, DevelopmentalCell Line, TumorWound HealingImmunohistochemistryCell CycleStem CellsCell MovementRNA, MessengerMolecular Sequence DataAnaplasiaMorphogenesisEpidermisCell DedifferentiationLymphocyte ActivationGene ExpressionGene Expression RegulationReverse Transcriptase Polymerase Chain ReactionMesodermAmputation StumpsAnimal StructuresCell SurvivalFibroblast Growth FactorsHomeodomain ProteinsPentosan Sulfuric PolyesterMice, Inbred C57BLTretinoinTime FactorsCell LineZebrafish ProteinsAnimals, Genetically ModifiedAmino Acid SequenceKi-67 AntigenGenes, HomeoboxBlotting, WesternDermisModels, BiologicalTranscription FactorsCartilageBase SequenceBody PatterningProliferating Cell Nuclear AntigenPhosphorylationT-LymphocytesRNA InterferenceFlow CytometryTumor Cells, CulturedMice, Knockout